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Proceedings. 11th International Symposium on Electrets最新文献

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Accumulation of charges in polycarbonate due to positron irradiation 由于正电子辐照聚碳酸酯中电荷的积累
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042973
D. Cangialosi, H. Schut, M. Wubbenhorst, J. van Turnhout, A. van Veen
{"title":"Accumulation of charges in polycarbonate due to positron irradiation","authors":"D. Cangialosi, H. Schut, M. Wubbenhorst, J. van Turnhout, A. van Veen","doi":"10.1109/ISE.2002.1042973","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042973","url":null,"abstract":"Positron annihilation lifetime spectroscopy (PALS) is a powerful technique for the study of free volume in polymers. The lifetime of ortho-positronium (o-Ps), a bound state of an electron and a positron, can be used to assess the cavity size, while the intensity can be used to characterize the number of cavities. In the past results have been published, which suffer from artifacts, whereby the drop in o-Ps intensity is not related to a decrease in the number of cavities. One of the possible artifacts is the build-up of an internal charge during long-term exposure to positron irradiation, which affects the o-Ps intensity. In this study we focus on the charging created in polycarbonate (PC) by positron radiation, which we investigated by the laser intensity modulation method (LIMM) and by charge-decay experiments, both isothermally and with TSD. From these measurements we conclude that: 1) the o-Ps intensity decrease during prolonged positron irradiation is due to the accumulation of a space charge; 2) in reverse, changes in the o-Ps intensity may be used to probe electric fields in dielectrics.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124358333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Properties of liquid flow in circulatory system with novel EHD pump 新型EHD泵循环系统液体流动特性研究
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042997
R. Hanaoka, S. Takata, Hiroyuki Nakamichi, T. Fukami, M. Shimbo
{"title":"Properties of liquid flow in circulatory system with novel EHD pump","authors":"R. Hanaoka, S. Takata, Hiroyuki Nakamichi, T. Fukami, M. Shimbo","doi":"10.1109/ISE.2002.1042997","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042997","url":null,"abstract":"Using EHD pumps arranged a pseudo-doughnut electrode against a grounded plane or sphere electrode, the flow in the liquid circulatory system was examined. When a dc voltage was applied to the electrode, the liquid circulated soundlessly and slowly through an insulating pipe of the circulatory system. The special nozzle in which was termed spiral nozzle was designed in order to create a more effective liquid flow. This nozzle can make the spiral structure of liquid jets emerging from the outlet of nozzle. The fluid frictions which act on the circulating liquid can be decreased by the spiral liquid jet. In this paper, the spiral structure of jets has been analyzed using the basic equations of fluid mechanics.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130560266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new technique for simultaneous measurements of space charge and TSDC in polymer films 同时测量聚合物薄膜中空间电荷和TSDC的新技术
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042937
J. Reboul, M. Rouff
{"title":"A new technique for simultaneous measurements of space charge and TSDC in polymer films","authors":"J. Reboul, M. Rouff","doi":"10.1109/ISE.2002.1042937","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042937","url":null,"abstract":"Profiles of space charge and spectra of thermo-stimulated discharge currents (TSDC) are valuable pieces of information for the study of injection, transport and trapping of charges and polarization in insulating materials. Space charge measurements are generally realized by non destructive methods, which allow following the evolution of the density of charges but without information on their nature. On the contrary, studies of TSDC generally give information on the nature of the charges, but each run makes them disappear. Coupling the results from the two techniques is of great interest. The present work is concerned with the development of a new technique for simultaneous measurements of space charge profiles and TSDC on polymer films. A controlled thermo-electrical module is used to generate the appropriate thermal stimulations and both measurements can be made without dismantling the measuring cell. The processing of the current response to small alternative temperature variations leads to the space charge profile. The current response to a linear increase of temperature gives directly the TSDC spectrum.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133778436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research in the NO/sub 2/-gas sensitive properties of polyaniline self-assembled film 聚苯胺自组装膜的NO/ sub2 /-气敏性能研究
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043002
Y.D. Jiang, G. Xie, D. Li, Z.M. Wu, C.H. Huang
{"title":"Research in the NO/sub 2/-gas sensitive properties of polyaniline self-assembled film","authors":"Y.D. Jiang, G. Xie, D. Li, Z.M. Wu, C.H. Huang","doi":"10.1109/ISE.2002.1043002","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043002","url":null,"abstract":"Self-assembly as a novel method to prepare ultrathin functional films has drawn more and more attention in recent years. The preparation methods, structure, characterization and NO/sub 2/ gas sensitive properties of polyaniline (PAN) ultrathin films are studied in this paper. Firstly, PAN, bpolyphthalocyanine and polycation were prepared as raw materials for self-assembling PAN ultrathin films. The self-assembled PAN ultrathin films with polymeric and phthalocyanines were prepared based on doping-induced deposition effect. These films were characterized by ultraviolet/visible (UV-Vis) spectroscopy. The study on self-assembling mechanism shows that it is acids that drives the self-assembling process, which is dependent on the PAN solution property, the types of solvents and polymeric acids, the molecular weight of polymers and temperature. At last, the NO/sub 2/ gas sensitive properties is studied in this paper.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133303075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bioelectret state in dextrin: a study by thermally stimulated discharge current technique 糊精中的生物驻极体状态:热刺激放电电流技术的研究
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043004
V. Mishra, S. Thomas, R. Nath
{"title":"Bioelectret state in dextrin: a study by thermally stimulated discharge current technique","authors":"V. Mishra, S. Thomas, R. Nath","doi":"10.1109/ISE.2002.1043004","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043004","url":null,"abstract":"Bioelectret state has been proposed to be a universal property of biomolecules and to play an important role in various biological phenomena. In the present investigation bioelectret state in a polysaccharide, dextrin, has been studied using the thermally stimulated discharge current (TSDC) technique. The polysaccharide has been found to be able to manifest the bioelectret state; the TSDC spectrum is characterised by three peaks at temperatures around 170K, 220K and 270K. The bound water molecules are identified as the source of polarisation storage for all peaks. The 170K peak is ascribed to bound water molecules directly attached to the polypeptide backbone; 220K peak is ascribed to a second layer of multiple hydrogen bonded water molecules, proposed to be a chain like structure around the polypeptide backbone and the 270K peak is attributed to the bound water molecules adsorbed on the surface of the polysaccharide matrix.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114845785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
In vivo study of percutaneous absorption of lidocaine using electret in the rat 驻极体对大鼠利多卡因经皮吸收的体内研究
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043031
L. Cui, J. Jiang, C. Song, W. Q. Zhao, D. Weiquan, Z. Xia
{"title":"In vivo study of percutaneous absorption of lidocaine using electret in the rat","authors":"L. Cui, J. Jiang, C. Song, W. Q. Zhao, D. Weiquan, Z. Xia","doi":"10.1109/ISE.2002.1043031","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043031","url":null,"abstract":"The present work was undertaken to study the effect of electret on transdermal drug delivery in vivo. The experiment was carried out in depilated abdominal rat skin using lidocaine hydrochloride as a model compound. Rats were divided into control and electret group. The electrets were applied on the drug in a vial and the blood samples were taken from jugular vein at predetermined time intervals. The concentration of lidocaine in plasma was measured by high proficiency liquid chromatograph (HPLC) after extraction. The plasma lidocaine concentration was significantly increased in electret group. The results suggested that electret could promote the permeability of drug by its effect on the structure of epidermis and blood flow change.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115367687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corona-induced partial discharges, internal charge separation and electromechanical transducer properties in cellular polymer films 电晕感应局部放电、内部电荷分离和细胞聚合物薄膜的机电换能器特性
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042942
Martin Wegener, Mika Paajanen, W. Wirges, R. Gerhard-Multhaupt
{"title":"Corona-induced partial discharges, internal charge separation and electromechanical transducer properties in cellular polymer films","authors":"Martin Wegener, Mika Paajanen, W. Wirges, R. Gerhard-Multhaupt","doi":"10.1109/ISE.2002.1042942","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042942","url":null,"abstract":"Recently, porous or cellular polymer films have received a lot of interest as materials for sensor and actuator applications. Films of cellular polypropylene have shown superior electromechanical thickness response when compared to conventional non-porous piezoelectric polymer materials. The electromechanical effect in cellular films originates from electrical discharges across internal gas-filled cells during preparation. The resulting charge separation is different from the charge-separation and dipole-orientation processes in non-cellular piezoelectric films. The aim of this work is to study the relationship between the partial discharges inside the cellular PP and its piezoelectric response. The focus is on the physical effects in the film at the threshold voltage that leads to a piezoelectric response. We studied the effects of charging voltage and charging time on partial discharges, surface potential and piezoelectric coefficient for a few cellular-film grades with different thicknesses. Also, the visible electroluminescence from numerous spots across the film surface during corona charging has been studied.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115422701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 41
Attenuation of the sound transmitted through the piezoelectric curved membrane: the effect of the electrically controlled elasticity 通过压电弯曲膜的声音衰减:电控弹性的影响
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042985
P. Mokry, E. Fukada, K. Yamamoto
{"title":"Attenuation of the sound transmitted through the piezoelectric curved membrane: the effect of the electrically controlled elasticity","authors":"P. Mokry, E. Fukada, K. Yamamoto","doi":"10.1109/ISE.2002.1042985","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042985","url":null,"abstract":"Principles of the sound transmission control using a thin curved membrane made of piezoelectric polymer are presented in this paper. Utilizing both the direct and inverse piezoelectric effects simultaneously, which is realized by connecting the external circuit with a negative capacitance, the elastic properties of piezoelectric materials can be controlled. The effective value of the Young's modulus of the PVDF and P(VDF/TrFE) films can be governed to a large extent (theoretically in the range from -/spl infin/ to /spl infin/). Calculation of the transmission loss of an audible sound through the curved piezoelectric membrane is used for the theoretical analysis of the application of this phenomenon in acoustics. Transmission loss is expressed as a function of frequency, radius of curvature, Young's modulus and the capacity of the external circuit. The effects of the values of these variables on the transmission loss and related aspects are described. The comparison of theoretical predictions and experimental results is discussed.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115765065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Dielectric barrier micro-discharges: mechanism for the charging of piezoelectric polymer foams 介质阻挡微放电:压电聚合物泡沫的充电机理
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042955
M. Lindner, R. Schwodiauer, M. Dansachmuller, S. Bauer-Gogonea, S. Bauer
{"title":"Dielectric barrier micro-discharges: mechanism for the charging of piezoelectric polymer foams","authors":"M. Lindner, R. Schwodiauer, M. Dansachmuller, S. Bauer-Gogonea, S. Bauer","doi":"10.1109/ISE.2002.1042955","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042955","url":null,"abstract":"Dielectric barrier micro-discharges within the voids of cellular polymers are shown to be responsible for the charging of cellular space-charge electrets and also for the large piezoelectricity in these materials. Above the threshold voltage for breakdown in the voids, the micro-discharges are evidenced by light emission from the polymer, as well as by hysteresis loops in the dielectric and electromechanical properties versus applied voltage. Although cellular space-charge electrets are based on nonpolar dielectrics, the hysteresis in displacement and mechanical strain demonstrate close similarities to ferroelectric materials. The monitoring of the light emission during breakdown provides a quick and easy check for the suitability of cellular space-charge electrets for piezoelectric applications. It also allows for the visualisation of micro-pores in foams in a non-destructive way.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122464518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Generation of charged sub-micron solid particles and their application for visualizing microscopic charge distribution 带电亚微米固体粒子的产生及其在微观电荷分布可视化中的应用
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043020
Y. Murata, S. Tsukamoto
{"title":"Generation of charged sub-micron solid particles and their application for visualizing microscopic charge distribution","authors":"Y. Murata, S. Tsukamoto","doi":"10.1109/ISE.2002.1043020","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043020","url":null,"abstract":"A new method for generating ultra-fine charged solid particles were investigated. The particles were generated from liquid ink droplets. The diameter and the charge of obtained particles are 0.14 to 0.89 /spl mu/m and 9 /spl times/ 10/sup -18/ to 8 /spl times/ 10/sup -16/ C respectively. Using the particles, charge distributions of fine electret fibers were visualized.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115958218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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